[emacs] get rid of cedet's imenu creator

no-cedet-imenu.el

(defun bmz/restore-imenu-index-function ()
  "Restore `imenu-create-index-function' for current major-mode.

Note this would reset to `imenu-default-create-index-function', but some modes
have its own implementation."
  (interactive)
  (let* ((func-name (cond
                    ((eq major-mode 'python-mode)
                     'python-imenu-create-index)
                    ((eq major-mode 'js2-mode)
                     'js2-mode-create-imenu-index)
                    ((eq major-mode 'espresso-mode)
                     'espresso--imenu-create-index)
                    (t
                     'imenu-default-create-index-function))))
    (eval `(setq-mode-local ,major-mode imenu-create-index-function
                     func-name))
    (setq imenu-create-index-function func-name))) 

(add-hook 'python-mode-hook 'bmz/restore-imenu-index-function)